1919.] NATURAL SCIENCES OF PHILADELPHIA. 115 



cidedly infuscate, leaving a narrow pale postocular line ventrad 

 of the dark line; dorsum of the head rarely with a distinct medio- 

 longitudirial dark line, which, when present, is almost never com- 

 plete, being divided in two longitudinally, and when continued 

 on the pronotum represented only by a hair line on the median 

 carina. 



Tegmina with the base color generally more grayish than the 

 general pale color, more approximating drab, benzo brown and 

 hair brown, the proximal half of the marginal and discoidal fields 

 suffused to a greater or lesser degree with the dark color, this 

 weakly maculate in the female, and in both sexes persistent distad 

 only along the humeral trunk; subcostal stripe indicated in both 

 sexes, ranging from sulphur yellow to aniline yellow and buck- 

 thorn brown. Caudal femora of the general color, occasionally 

 washed with the darker color along the dorsal section of the external 

 face; transverse dark bars on the dorsal face of the caudal femora 

 are almost never indicated in typical material of macclungi, al- 

 though suggested in many intermediate individuals: caudal tibise 

 ranging from carnelian red and mikado brown to coral red, spines 

 black tipped. 



There is a geographic correlation in color tone which is fairly 

 evident in the case of the material from the Platte Valley in Neb- 

 raska, these being on an average distinctly paler, and this is as 

 true of the few (4) from Kearney as for the extensive sand-hill 

 series from North Platte. Certain other color correlations might 

 be mentioned, but the series, in each case, is not extensive enough 

 to warrant comment. 



The extension of the dark lateral bars on the sides of the dorsum 

 of the pronotum, as found in Mer. mac. maculipennis, is present 

 in this race, but is not common, three males alone having it indi- 

 cated. Material intermediate between this race and true maculi- 

 pennis shows this more generally indicated. 



Distribution. — Fron the eastern Yellowstone Valley of Montana 

 (Forsyth and Glendive) south typically to southern Nebraska 

 (Lincoln and Haigler), western Kansas (Syracuse), southern Colo- 

 rado (Holly and Pueblo) and northern Utah (Salt Lake City and 

 Maple Peak). The eastern limit of the range is apparently reached 

 in south-central Wisconsin (Lone Rock), the central axis of Illinois 

 and southern Missouri (Hollister), while westward it is unknown 

 beyond the Utah localities given above. For data on the area 

 occupied by intermediates between Mer. mac. maculipennis and 

 Mer. mac. macclungi see under the former. 



